Can't parse xml file in jar file when can't connect to web server

Question

My JNLP application throw ConnectException when trying to parse xml during web server offline.
Steps,
1. JNLP application has been launched once and all related jar and xml files are already downloaded to local cache.
2. Then I close web server to test offline launch.I launch the JNLP application using shortcut with -offline parameter.
3. However the JRE internal xml parser tries to connect to web server and report connection error as web server is down now.
My concern is the file is already in the cache, why java still try to connect URL. This error happens in JRE 1.5, but it doesn't happen in JRE 1.6. It only happens when web server is down in JRE 1.5.
I think it may be a bug of JRE, do any one can give me some hint about how to resolve?
Thanks in advance!!
I also moved the code piece to a simple web start example, following it the error and code pieces.
Error Trace in Java console,
ava.net.ConnectException: Connection refused: connect
     at java.net.PlainSocketImpl.socketConnect(Native Method)
     at java.net.PlainSocketImpl.doConnect(Unknown Source)
     at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
     at java.net.PlainSocketImpl.connect(Unknown Source)
     at java.net.Socket.connect(Unknown Source)
     at java.net.Socket.connect(Unknown Source)
     at sun.net.NetworkClient.doConnect(Unknown Source)
     at sun.net.www.http.HttpClient.openServer(Unknown Source)
     at sun.net.www.http.HttpClient.openServer(Unknown Source)
     at sun.net.www.http.HttpClient.<init>(Unknown Source)
     at sun.net.www.http.HttpClient.New(Unknown Source)
     at sun.net.www.http.HttpClient.New(Unknown Source)
     at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
     at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
     at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
     at sun.net.www.protocol.jar.URLJarFile.retrieve(Unknown Source)
     at sun.net.www.protocol.jar.URLJarFile.getJarFile(Unknown Source)
     at sun.net.www.protocol.jar.JarFileFactory.get(Unknown Source)
     at sun.net.www.protocol.jar.JarURLConnection.connect(Unknown Source)
     at sun.net.www.protocol.jar.JarURLConnection.getInputStream(Unknown Source)
     at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
     at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(Unknown Source)
     at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(Unknown Source)
     at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
     at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
     at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
     at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
     at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
     at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
     at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
     at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
     at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
     at EntXmlUtil.buildDocument(EntXmlUtil.java:57)
     at Notepad.testParseXML(Notepad.java:870)
     at Notepad.main(Notepad.java:153)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at com.sun.javaws.Launcher.executeApplication(Unknown Source)
     at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
     at com.sun.javaws.Launcher.continueLaunch(Unknown Source)
     at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
     at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Notepad.java
public void testParseXML() {
     URL xmlURL=Notepad.class.getClassLoader().getResource("xml/Login.xml");
     try {
               org.w3c.dom.Document doc = EntXmlUtil.buildDocument(xmlURL);
               System.out.println("Test"+doc);
          } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
EntXMLUtil.java
private static DocumentBuilderFactory dbf = null;
     static {
          dbf = DocumentBuilderFactory.newInstance();
          dbf.setNamespaceAware(true);
          dbf.setValidating(true);
          dbf.setIgnoringComments(true);
          dbf.setIgnoringElementContentWhitespace(true);
public static DocumentBuilderFactory getDocBuilderFactory() {
          return EntXmlUtil.dbf;
public static Document buildDocument(URL url, String systemId) throws Exception {
          DocumentBuilder db;
          Document doc;
          InputStream is;
          String sysId = null;
          if(systemId == null)
               sysId = url.toExternalForm();
          else
               sysId = systemId;
          db = EntXmlUtil.getDocBuilderFactory().newDocumentBuilder();
          is = url.openStream();
          doc = db.parse(is, sysId);
          is.close();
          return doc;
     }

Answer 1

I finally got a temperary work around for this issue, using JRE5 version lower than update 16(not include update 16).
i found Sun modify the URL which returned by XXX.class.getClassLoader().getResource("xml/Test.xml,") after update 15, previous it is related with the cache path, like C:\Users\epenwei\AppData\LocalLow\Sun\Java\Deployment\cache\javaws\http\Dlocalhost\P80\DMEntriView\DMapp\AMNotepad.jar!/xml/Test.xml, but after it changes to network path, like http://localhost/Notepad/app/notepad.jar!/xml/Test.xml. However, the latter address doesn't work in Sun's own class com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity if offline.It tried to create new URL then connect to web server. So exception is thrown since web server is down.
if (reader == null) {
stream = xmlInputSource.getByteStream();
if(stream != null && encoding != null)
declaredEncoding = true;
if (stream == null) {
URL location = new URL(expandedSystemId);
URLConnection connect = location.openConnection();
if (connect instanceof HttpURLConnection) {
     setHttpProperties(connect,xmlInputSource);
I am not sure whether it is a Java new bug since I only read the codes and didn't debug Sun code. But I am very curious that I have already specify <j2se version="1.5.0_12" href="http://java.sun.com/products/autodl/j2se" /> to specify update 12 for my jws application. And I also see the Java console display like following
Java Web Start 1.5.0_18
Using JRE version 1.5.0_12 Java HotSpot(TM) Client VM
Why java still uses my latest jre lib to run my application?
Edited by: wei000 on May 22, 2009 5:32 AM